压铸态SiC_w/6061Al复合材料中弹性模量的不均匀性  

Inhomogeneity of Elastic Modulus in the SiC_w/6061Al Composites as Squeeze Cast

作　　者：姜传海[1] 吴建生[1] 王德尊[2] 

机构地区：[1]上海交通大学教育部高温材料及高温测试重点实验室,上海200030 [2]哈尔滨工业大学材料科学与工程学院,哈尔滨150001

出　　处：《材料工程》2002年第1期25-28,共4页Journal of Materials Engineering

摘　　要：借助图象仪与扫描电镜联机系统 ,测量压铸态 Si Cw/6 0 6 1Al复合材料中的晶须取向分布。基于剪滞后模型及晶须的实际分布情况 ,分析复合材料弹性模量的不均匀性。采用超声声速法 ,测量复合材料的弹性模量。结果表明 ,压铸态复合材料中晶须在垂直压铸方向具有一定择优取向性 ,晶须体积分数越高其择优取向程度越明显 ,从而造成复合材料各向弹性模量的不均匀性。By using the system of image analyzer connected with scanning electron microscope, the whisker orientation in the SiC w/6061Al composite as squeeze cast was measured According to the shear lag model and the actual distribution of whisker in composite, the inhomogeneity of elastic modulus in composite was analyzed With the method of ultrasonic velocity, the elastic modulus of composite was measured The results shown that the whiskers of composite are preferred orientation normal to the direction of squeeze cast The higher the volume fraction of whisker, the more extent of preferred orientation of it, and the inhomogeneity of elastic modulus is mainly due to the difference of whisker distribution in composite The elastic modulus of composite as squeeze cast from experiment is close to that from theoretical calculation

关 键 词：碳化硅晶须 铝基复合材料 晶须取向 弹性模量 超声波 不均匀性 

分 类 号：TB333[一般工业技术—材料科学与工程]